The table illustrates the changes in the number of the UK population over a century-period, from 1911 to 2011, alongside focusing on two age demographics: 15- and 75-years old people, with figures measured in both millions and percentages.
Overall, the total population in the UK grew steadily over the century, with the proportion of young people aged 15 experienced a slight decline, whereas the figure for the elder (aged 75) saw a substantial rise throughout, indicating aging population. Notably, the number of young female generations also decreased.
As for the total numbers, the UK population grew significantly, skyrocketing from 36.1 million in 1911 to 56.1 million in 2011, a twenty-million increase over the century. Despite this growth, the percentage of people aged 15-years old dropped from 1.86% in 1911 to 1.23% by the end of the timeframe. Meanwhile, the number of males in this age group witnesses a marked increase (334,200 to 354,400), whereas female counterparts dipped from 335,700, they remained just under that level (333,700) by 2011, which was 2,000 lower than its initial level.
Turning to older people, the proportion of individuals aged 75 nearly tripled to 0.70% in 2011 from its original figure. Moreover, male elders saw massive five-fold growth, peaking at 181,300 for the rest of span. Likewise, the figure for female people increased dramatically to reach 254,900 in 1961, before declining to 210,000 in the final year.